Rotary pump.



A. N. BAADEK HOIARX PUMP. APPLICATION FILED MAY 17. 1916.

1,237,273.- v Patented Aug. 21,1917.

3 SHEETSSHEET I.

ammo a @131 V I I flbtomwi A. N. BAADE.

ROTARY PUME. APPLICAHON FILED MAY 17. 1916.

1,237,273. Patented 21,1917.

3 SH -SHEET 2- ANDREW N. BAADE OF SAN ANSELMO CALIFORNIAQ I ROTARY PUMP.

Specification of Letters Patent.

Patented Aug. 21, 1917.

Application filed May 17, 1916. Serial No. 98,200.

17 '0 all whom it may concern:

Be it known that 1, ANDREW N. BAADE, a citizen of the United States,residing at San Anselmo, in the county of Marin and State of California,have invented certain new and useful Improvements in Rotary Pumps, ofwhich the following is a specification.

This invention relates to rotary pumps of the general type disclosed inPatents No. 1,050,905, granted to me Jan. 1, 1913, and No.1,112,515,granted to me Oct. 6, 1914, the primary object of the present inventionbeing to provide arotary pump which may be disposed in a horizontalposition and rotated in either'direction. A secondary object of theinvention is to reduce the number of parts and thereby lessen the cost.ofproduction'ahd also increase the ease of operation.

A rotary pump embodying my invention is illustrated in the accompanyingdrawings and the irwention resides in certain novel features which willbe hereinafter first fully described and then more particularly pointedout in the claims following the description.

In the drawings:

Figure 1 is a longitudinal-section of a rotary pump embodying my presentimprovements;

Fig. 2 is a transverse section of the same;

Fig. 3 is a perspective view of the stationary eccentric shaft and theblades mounted to rotate about the same with the connecting parts;

Fig. 4 is a transverse section showing another form of the invention.

In carrying out my present improvemcnts, I provide a horizontallydisposed oylinder 1 having its ends closed'by heads 2 and having apiston 3 mounted to rotate therein. Upon one of the heads 2 1s cast orrigidly secured a yoke 4 through which the driving shaft 5 extends andupon the said head, at the center thereof, is formed a boss 6constructed to accommodate an extension 7 upon the adjacent end of thepiston and also receive packing 8 which is compressed by a gland 9. Inthe outer end of the yoke 4 is fitted an anti-friction bearing 10 whichis covered and held in place by a cap 11 and .in the central shaftopenings through the said cap and the end of the yoke are secured feltwashers 12 whereby lubricant supplied to the bearing 10 will be retainedaround the same. The driving shaft 5 may be connected with a motor (notshown) in any convenient or preferred manner and its inner end isprovided with a threaded enlargement 13 which engages the projection 7of the piston so that the rotation of the driving shaft will betransmitted to the piston. While this threaded connection is efficientand is preferred,'by reason of its simplicity, it is to be understoodthat other means of connecting the driving shaft to the piston may beemployed Without involving any departure from the invention. That end ofthe piston provided with the extension 7 is also provided on its innerface at its axial center with a recess 14 in which is seated a trunnion15 on the eccentric shaft 16. The

opposite end of the said eccentric shaft is provided with an elongatedtrunnion 17 terminating in an angular portion 18 which engages anangular recess in a cap or plate 19 secured to the adjacent head of thecylinder. The said head of the cylinder is provided with a projection orelongation 20 so as to provide an extended bearing for the trunnion 17and the cooperating end of the piston is constructed with a similarprojection 21 fitting in the said extension 20 to rotate about the saidtrunnion. To reduce thefrictional wear between the parts Babbitt metal22-is inserted through the projection 21 and around trunnion 17 and alsoemployed to line the recess 14 as shown at 23.

The eccentric shaft and its trunnions are I provided with an axialpassage, indicated by dotted lines at 24, from which lateral open-' thecylinder 1 and a sleeve 27 secured to and extending between thecylindrical end plates and provided with longitudinal slots or grooves28 to accommodate the blades 29.

The sleeve 27 is a so provided with radial openings or passages toaccommodate the arms 30 which carry the blades 29 and the inner ends ofthese arms are pivotally attached to the rings 31 fitted upon theeccentric shaft 16 adjacent the ends thereof. It will be readily notedthat the said rings 31 are provided in two series, one series at eachend of the shaft and the rings in eachseries being equal in number tothe blade-carrying arms 30. Each ring is provided with a lateral lug 32and the inner end of each arm 30 is provided with'a reduced extension orear 33, pivot rods 34 being inserted through the registering lugs 32 and33 so as to pivotally connect each arm to one of the rings. It will alsobe noted that the pivot rods 34 are approximately equal in length to thelength of the piston sleeve 27 and each rod, therefore, serves as apivotal connection between two arms and the rings to carry the same. Thecoiiperating lugs 32 and 33 are of such dimensions-that by suitablyarrang- Y may be all brought into the same radial ing the rings to causesome of the lugs tobe' reversed relative to the other lugs, the armsplane cf the piston and, consequently, the several blades will besupported at equal distances from their ends and warping or bending ofthe blades will be counteracted so that the wear upon the same will beuniform throughout the travel. A spacing collar 35 is fitted upon theeccentric shaft 16 between the inner ends of the two series of rings 31so as to hold the rings in their proper positions and bushings 36 ofBabbitt metal are interposed between the eccentric shaft and the rings,as clearly shown. The cylinderl is provided at diametrically oppositepoints.

inder, at the top of the same and midway between the two ports, is alongitudinally extending abutment 40 while upon the oppo site side ofthe cylinder and extending between the ports is a wear plate 41 which issecured in place by bolts inserted though the wear p ate and thecylinder from the inner surface of-the wear plate and having their'headscountersunk so as to lie flush with the concave surface of the'wearplate.

By referring particularly to Fi 2, it willbe noted that the eccentricsha 16 is disposed-so that its surface, nearer the inner surface of thecylinder, w1ll be projected toward that side of the cylinder to whichthe wear plate is secured and it will furtherbe readily-understood thatas the piston is rotated, the blades will be retracted as they approachthe abutment and will be projected as they approach'the wear plate sothat they will be in contact with the wear plate throughout their travelover the same and will, consequently, form suction chambers inconnection with the same to draw in the water and cause it to travelthrough the cylinder and out through the outlet port.

It is thought the operation will be readily naeaara 5 understood. Motionis imparted to the piston through the driving shaft and the pistonthereby rotated past the abutment 40 and over the wear plate 41. As eachpair of arms 30 approach the abutment, the rings carrying said arms willbein such osition that the arms will be retracted re ative to the pistonand, consequently, will ride past the abutment which serves as a stopfor the water and prevents the ressure of the same choking the pistonand interfering with the successful operation of the pump. The eccentricshaft is held stationary by the engagement of its angular extremity 18with the cap 19 and, consequently, as the arms and blades are rotatedabout the shaft with the piston, the rings 31 will also be caused totravel about the eccentric shaft so that the arms will be giyen a radialsliding movement relativeto the piston and will be projected toward thewear plate as they approach the same. Inasmuch as the supports for eachpair of the arms completely encircle the eccentric shaft, the arms willmove steadily and evenly during the entire operation of the pump and thewater will, consequently, be drawn into and expelled from the pump in asteady active stream. The provision of these-"blade rings, whichcompletely encircle the eccentric shaft, eliminates or overcomes thenecessity for guides or retainers to support the parts to which theblade-carrying arms are connected and thereby reduces the cost ofmanufacture and also makes the operation of the pump smooth and easy. Byhaving the arms at opposite ends of each blade mounted upon a commonpivot rod, the tendency of the blade to bend under the pressure of thewater is overcome and the blade is held at a uniform distance from thethroughout its entire course of travel. The

parts are readily accessible for the purpose I of cleaning, renewin orrepairing the same and the apparatus wi loccupy but very little spacewhen in use.

In Fig. 4, I have shown the cylinder 42 as provided with'ports 43 atdiametrically opposite points and each of these ports opens into aconduit .44 extending to opposite sides of the structure. Either ofthese conduits may be an inlet so that the pump may be operated'ineither direction and it will be readily noted that it may. be operatedto draw in water from either or both sides of the conduit and alsodischarge at either or both sides thereof, thereby beingespeciallyadapted for use upon fire engines.- In this 1 posed to thewear plate is concentric with the said plate throughout its extent and,consequently, the blades will not move radially of the piston at anyperiod of their travel over the wear plate so that the suction chambersformed between the two successive blades, the wear plate and the pistonwill not vary in capacity and the pressure exerted upon the water willbe uniform. It will also be noted that the arms 50 will move quicklyfrom their inner to their outer positions so that, when the blades areacting upon the water, the arms carrying the blades will not besubjected to frictional resistance by the piston and, consequently, thepump will operate very easily and back pressure of the water upon theblades will be effectually counteracted. In this form of the invention aguide ring 51 is secured upon the eccentric shaft 48 and the inner endsof the several arms 50 are equipped with rollers 52 to ride upon thesurfaces of the eccentric shaft and the said ring and thereby minimizethe frictional resistance. The wear plate in the present instance isconcentric with the opposed surface of the piston so as to preserve theuniform dimensions and shape of the suction chambers formed by saidplate, the piston and the two successive blades.

Having thus described the invention, what is claimed as new is:

1". In a rotary pump, the combination'of a horizontally disposedcylinder having diametrically opposed ports, a piston disposed withinthe cylinder and journaled at its ends in the heads of the cylinder, anabutment secured within the cylinder and extending the full length ofthe same midway between said ports, a wear plate secured in the cylinderdiametrically opposite the abutment and extending between andterminating at the ports, a stationary eccentric shaft extending throughthe piston and having a portion of its surface concentric with the saidwear plate, blades carried by the piston, and means on-.the eccentricshaft for projecting the blades as they approach the wear plate andretracting the same as they approach the abutment.

2. In a rotary pump, the combination of a cylinder, a piston mountedconcentrically therein, an abutment secured within the cylinder andextending to the piston, a wear plate disposed diametrically oppositethe abutment, the cylinder being provided with ports between theabutment and the wear 1 plate, an eccentric shaft held against ro-'tation by the cylinder and disposed within the piston, blade ringsloosely encircling the eccentric shaft, blade-supporting arms pivoted tothe respective blade rings, and blades carried by the outer ends of saidarms to move over the wear plate.

3. In a rotary pump, the combination of a horizontally disposed cylinderhaving oppositely disposed ports, an abutment within the cylinderbetween the ports, a concentric piston mounted to rotate within thecylinder, an eccentric shaft secured in the cylinder and disposed withinthe piston, blades I carried by the piston, and means on the eccentricshaft acting, on the blades during rotation of the piston whereby theblades will be retracted as they approach the abutment and projectedtoward the cylinder at the side oppositethe abutment.

4. In a rotary pump, the combination of a cylinder, a concentric pistonmounted to rotate therein, an eccentric shaft within the piston heldagainst rotation, a plurality of rings loosely encircling said shaftwithin the piston, blade-carrying arms pivoted to the respective ringsand extending radially through the piston, and blades carried by theouter ends of said arms.

5. In a rotary pump, the combinatlon of a cylinder, a concentric pistonmounted to rotate therein, an eccentric shaft secured in the cylinderand held against rotation thereby and disposed within the piston,

series of blade rings loosely encircling said.

the eccentric shaft at each end thereof,

means between the two series of blade rings to separate said series,blade-carrying arms mounted radially in the piston at the ends 'of thesame, pivot rods each passing through longitudinally alinedblade-carrying arms at the ends of the piston and connecting said armsto the adjacent blade rings, and blades carried by said arms.

7. In a rotary pump, the combination of a stationary cylinder, aconcentric piston mounted to rotate therein, an eccentric shaft securedin thecylinder and disposed within the piston, bushings disposed aboutsaid shaft between the same and the ends of the piston, blade ringsmounted upon'said between said shaft and said rings, bladecarrying armspivoted to said rings and extending radially through the piston, andblades carried by said arms v 8. In a rotary pump, the combination of astationary cylinder, a piston mounted to rotate therein,- an eccentricshaft secured in the cylinder and held against rotation thereby anddisposed Within the piston, a series of blade rings loosely encirclingthe eccentric shaft at each end thereof, bladecarrying arms mountedradially in the piston at the ends of the same, pivot rods each passingthrough the longitudinally alined blade-carrying arms at the ends of thepiston and connecting said arms to the adjacent blade rings, and bladescarried by said arms,

mamas I 9. In a rotary pump, the combination of a stationary cylinderhaving recessed portions at its ends, a concentric piston disposedWithin the cylinder and having through the piston, and blades carried bythe outer ends of said arms'and adapted tobe housed Within the piston orprojected therefrom as the piston rotates about the eccentric shaft.

In testimony whereof I afix my signature;

ANDREW N. BAADE. [1 s.]

